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Which one of the following memories is not non-volatile computer memory?

Which one of the following computer Operating Systems is the most commonly used in the Top-500 supercomputers of the world?

What is the Z-RAM (Zero capacitor Random Access Memory) of the computer memory?

Which one of the following applications uses the UNIX as an Operating System?

Consider the following statements:
1. Unix is a multitasking, multi-user computer operating system.
2. The Unix operating system is now entirely coded in C-language.
Which of the statements given above is/are correct?

Who is the principal author of the Linux Kernel, a free and open source computer operating system? 

Consider the following characteristics about the conventional Dynamic Random Access Memory
1. It stores each bit of data in a separate capacitor within an integrated circuit
2. Capacitors of DRAM leak charges so the information/data eventually fades
3. It is a volatile memory
Which of the statements given above is/are correct?

Consider the following statements:
1. Joystick is found application in the Unmanned Aerial Vehicles (UAVs) and submersible Remotely Operated Vehicles (ROVs).
2. Joysticks are used in many industrial and manufacturing applications such as cranes, assembly lines, mining trucks, and excavators.
Which of the statements given above is/are correct?

Consider the following statements:
1. In computer graphic, GUI allows users to interact with electronic devices using images.
2. GUIs are used in MP3 players, portable media players or gaming devices.
Which of the statements given above is/are correct?

Which one of the following is used to sense the movement of the stick of Joystick?